Compensation Layer in OLED Second Electrode
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Solution Overview
Problem
Organic light emitting display devices face defects due to foreign bodies between electrodes, leading to shorts and reduced visibility, which existing solutions attempt to address by using thick materials, increasing costs and reducing process efficiency.
Innovation Solution
Incorporating a compensation layer with a varying composition ratio of compensation materials in the second electrode, specifically designed to prevent shorts between the cathode and anode, while maintaining thinness and efficiency by controlling the partial pressure of gases during electrode formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thick material is spread to prevent short due to foreign body, then reliability is improved, but visibility is reduced and device complexity increases
Solution Approach 1:
The patent applies local quality by creating a compensation layer with non-uniform composition - the layer has a first composition ratio close to the organic light emitting layer and a second composition ratio at the opposite interface, allowing different regions of the same layer to serve different functions: preventing shorts while maintaining visibility
Solution Approach 2:
The compensation layer uses composite materials with varying composition ratios of compensation materials, combining the benefits of foreign body prevention with optical transparency by strategically distributing different material compositions within the layer
2Reliability
If a thick material is spread to prevent short due to foreign body, then reliability is improved, but manufacturing cost increases and productivity decreases
Solution Approach 1:
The patent merges the compensation function into the existing electrode formation process by controlling the composition ratio distribution within the same layer, eliminating the need for separate thick material spreading processes and additional equipment
Solution Approach 2:
The compensation layer serves multiple functions simultaneously: it prevents shorts due to foreign bodies, maintains display visibility, and is formed within the existing manufacturing process framework, making the solution universally applicable without adding process steps
Data Source
AI summary
The present invention relates to an organic light emitting display device. An aspect of the present invention provides an organic light emitting display device comprising a first electrode on a substrate, an organic light emitting layer on the substrate, and a second electrode including at least two layers of which a composition of compensation materials is different on the organic light emitting layer.